<template>
  <div class="home-container">
    <!-- 顶部导航栏组件 -->
    <van-nav-bar class="page-nav-bar" fixed>
      <van-button class="search-btn" 
      slot="title" type="info" size="small" 
      round icon="search"
      to="/search">搜索</van-button>
    </van-nav-bar>
    <!-- 频道列表 -->
   <van-tabs class="channel-tabs" v-model="active" swipeable animated>
    <van-tab :title="channel.name" 
       v-for="channel in channels" 
       :key="channel.id"
       >
       <!-- 文章列表 -->
       <article-list ref="article-list" :channel="channel" />
      </van-tab>
      <!-- 汉堡按钮 -->
       <div slot="nav-right" class="placeholder"></div>
       <div slot="nav-right" class="hamburger-btn" @click="isChannelEditShow=true">
        <i class="toutiao toutiao-gengduo"></i>
       </div>
   </van-tabs>
   <van-popup
  v-model="isChannelEditShow"
  closeable
  close-icon-position="top-left"
  position="bottom"
  :style="{ height: '100%' }"
>
  <channel-edit 
  :my-channels="channels" 
  :active-index="active" 
  @update-active="onUpdateActive"
  />
</van-popup>
  </div>
</template>

<script>
import { getUserChannels } from '@/api/user';
import ArticleList from './components/article-list';
import ChannelEdit from './components/channel-edit';
import { mapState } from 'vuex'
import { getItem } from '@/utils/storage.js'
export default {
     name: 'HomeIndex',
     components:{
      ArticleList,ChannelEdit
     },
     computed: {
       ...mapState(['user'])
     },
     data() {
       return {
         active: 0,
         channels:[],
         isChannelEditShow:false
       }
     },
     created(){
      this.loadChannels()
     },
     methods:{
      async loadChannels(){
        let channels = []
   
        if (this.user) {
          // 已登录，请求获取用户频道列表
          const { data } = await getUserChannels()
          channels = data.data.channels
        } else {
          // 未登录，判断是否有本地的频道列表数据
          const localChannels = getItem('TOUTIAO_CHANNELS')
          // 如果存在本地的频道列表数据
          if (localChannels) {
            channels = localChannels
          } else {
            // 没有，请求获取默认频道列表
            const { data } = await getUserChannels()
            channels = data.data.channels
          }
        }
      
        this.channels = channels
        // try{
        //   if(this.user){
        //     const{ data }=await getUserChannels()
        //     this.channels = data.data.channels
        //   }else{
        //     const localChannels = getItem('TOUTIAO_CHANNELS')

        //     if(localChannels){
        //       this.channels = localChannels
        //     } else{
        //       const { data } = await getUserChannels()
        //       this.channels = data.data.channels
        //     }
        //   }
        //   this.channels = channels
        // }catch(err){
        //   this.$toast('获取频道数据失败')
        // }
      },
      onUpdateActive(index,isChannelEditShow = true){
        this.active = index
        this.isChannelEditShow = isChannelEditShow
      }
     }
   }
</script>

<style scoped lang="less">
.home-container {
  padding-top: 174px;
  /deep/ .van-nav-bar__title {
    max-width: unset;
  }
  .search-btn {
    width: 555px;
    height: 64px;
    background-color: #5babfb;
    border: none;
    font-size: 28px;
    .van-icon {
      font-size: 32px;
    }
  }
  /deep/ .channel-tabs {
  .van-tabs__wrap {
     position: fixed;
     top: 92px;
     z-index: 1;
     left: 0;
     right: 0;
     height: 82px;
  }

  .van-tab {
    min-width: 200px;
    border-right: 1px solid #edeff3;
    font-size: 30px;
    color: #777777;
  }

  .van-tab--active {
    color: #333333;
  }

  .van-tabs__nav {
    padding-bottom: 0;
  }

  .van-tabs__line {
    bottom: 8px;
    width: 31px !important;
    height: 6px;
    background-color: #3296fa;
  }
  .placeholder {
     flex-shrink: 0;
     width: 66px;
     height: 82px;
    }
  .hamburger-btn {
     position: fixed;
     right: 0;
     display: flex;
     justify-content: center;
     align-items: center;
     width: 66px;
     height: 82px;
     background-color: #fff;
     opacity: 0.902;
   
     i.toutiao {
       font-size: 33px;
     }
     &:before {
       content: '';
       position: absolute;
       left: 0;
       width: 1px;
       height: 100%;
       background-image: url(~@/assets/gradient-gray-line.png);
       background-size: contain;
     }
    }
  }
}
</style>